I looked up the difference between Creon and Kreon. This is what I found (keep in mind that the Creon in Antigone is the same as the one in Oedipus):
Are they the same?
No, Creon in 'Medea' wasn't the same as Creon in 'Antigone'. In the first case, Creon was the King of Corinth and the father of Princess Creusa. Both father and daughter were killed by Medea, who didn't want to let go of her husband Jason.
In the second case, Creon was the King of Thebes. He also was the father of Megara and thereby father-in-law to Heracles. He was killed by Lycus, who was Nycteus' brother. Nycteus was the father of Nycteis, who married Theban King Polydorus. Their son, Theban King Labdacus, was the father of Theban King Laius, who married Creon's sister Jocasta.